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Zorluk: OrtaHigh Availability and Disaster Recovery Design

A company is designing a multi-region disaster recovery (DR) architecture for its customer portal. The primary infrastructure is deployed in us-east-1, and the standby infrastructure is in us-west-2. The database tier uses Amazon Aurora PostgreSQL. The business requirements state a Recovery Time Objective (RTO) of less than 15 minutes and a Recovery Point Objective (RPO) of less than 2 minutes. Outbound database traffic to external APIs must be resilient to Availability Zone (AZ) failures in both regions. Which architecture should a solutions architect design to meet these requirements with the lowest operational complexity?

  1. Deploy an Amazon Aurora Global Database with the primary cluster in us-east-1 and a secondary cluster in us-west-2. Deploy NAT Gateways in multiple Availability Zones in each region. Configure Route 53 with failover routing using active-passive health checks on the application endpoints.Cevap
  2. B
    Deploy Amazon RDS for PostgreSQL in us-east-1 with a Multi-AZ deployment, and configure daily cross-region snapshots to us-west-2. Configure read scaling by directing read traffic to the passive RDS standby instance. Configure Route 53 with geolocation routing.
  3. C
    Deploy Amazon Aurora PostgreSQL cross-region read replicas from us-east-1 to us-west-2. Deploy a single NAT Gateway in the primary Availability Zone of each region to centralize outbound traffic. Configure Route 53 with latency-based routing policies.
  4. D
    Deploy an Amazon Aurora Global Database with the primary cluster in us-east-1 and a secondary cluster in us-west-2. Configure a Route 53 Private Hosted Zone for private service resolution, but associate it only with the us-east-1 VPC. Keep the application servers in us-west-2 powered down under a pilot light configuration.

Cevap

Deploy an Amazon Aurora Global Database with the primary cluster in us-east-1 and a secondary cluster in us-west-2. Deploy NAT Gateways in multiple Availability Zones in each region. Configure Route 53 with failover routing using active-passive health checks on the application endpoints.
The correct architecture uses Amazon Aurora Global Database to achieve low-latency replication that satisfies the sub-2-minute RPO constraint. Setting up Route 53 failover routing handles active-passive failover automatically, which allows the application to meet the 15-minute RTO constraint. Additionally, deploying NAT Gateways across multiple Availability Zones in each region ensures that outbound traffic routes are highly available and resilient to individual Availability Zone failures.

Adım Adım Çözüm

1
Select a cross-region replication method that meets the RPO constraint of less than 2 minutes.
Amazon Aurora Global Database provides fast, physical replication with lag typically under one second.
This satisfies the strict RPO requirement, whereas snapshot restoration would exceed the RPO limit.
2
Configure the DNS routing strategy to automate failover and meet the RTO constraint of less than 15 minutes.
Route 53 active-passive failover routing policy routes traffic based on health check statuses.
Active-passive configuration ensures traffic is dynamically rerouted to the secondary region if the primary region goes offline.
3
Verify high availability for outbound traffic paths in both regions.
Deploy NAT Gateways in multiple Availability Zones in each VPC.
Outbound API calls must not fail if a single Availability Zone experiences an outage, so redundant NAT Gateways are required.

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High Availability and Disaster Recovery Design
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High Availability and Disaster Recovery Design

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